/*
 * Copyright (c) 2012 Andrea De Rinaldis <ozioso at ipignoli.dyndns.org>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.dyndns.ipignoli.droidcruise.controller;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import org.dyndns.ipignoli.droidcruise.R;
import android.app.Activity;
import android.content.Context;


public class DeviceIdentifier extends MyAsyncTask<Object, Integer, String>{
  private static final String DEVICE_ID_FILE_NAME = "deviceID";

  public DeviceIdentifier(Activity activity, EndTaskListener<String> callback){
    super(activity.getResources().getString(R.string.Device_identification),
        activity, callback, false);
  }

  @Override
  protected String doTheWork(Object... fill) throws Exception{
    byte[] id = new byte[36];
    InputStream is = null;
    try{
      is =
          new BufferedInputStream(getActivity().openFileInput(
              DEVICE_ID_FILE_NAME));
      is.read(id);
      return new String(id);
    }catch(FileNotFoundException e){
      OutputStream os = null;
      try{
        id = UUID.randomUUID().toString().getBytes();
        os =
            new BufferedOutputStream(getActivity().openFileOutput(
                DEVICE_ID_FILE_NAME, Context.MODE_PRIVATE));
        os.write(id);
        return new String(id);
      }finally{
        if(os != null)
          os.close();
      }
    }finally{
      if(is != null)
        is.close();
    }
  }
}
